package org.obsidianrad.utils;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * Utility class per recuperare il contenuto di un file o di un input stream
 * @author eliosh
 * @version $Rev: 4 $
 * @lastautorcommit $Author: eliosh $
 * @lastdatecommit $Date: 2009-10-31 12:37:28 +0100(sab, 31 ott 2009) $
 */
public class FileUtils {
	
	/**
	 * Legge il contenuto del file testuale
	 * @param file Oggetto File da leggere
	 * @return Stringa contenente il contenuto del file
	 * @throws IOException
	 */
	public static String getFileTextContent(File file) throws IOException{
		FileInputStream f = new FileInputStream(file);
		int len=f.available();
		String s="";
		for(int i=1; i<=len; i++) {
			s=s+(char)f.read();
		}
		f.close();
		return s;
	}
	
	/**
	 * Legge il contenuto del file sotto forma di array di byte
	 * @param file Oggetto File da leggere
	 * @return Array di byte contenente il contenuto del file
	 * @throws IOException
	 */
	public static byte[] getBytesFromFile(File file) throws IOException{
        InputStream is = new FileInputStream(file);
        
        // Get the size of the file
        long length = file.length();
    
        // You cannot create an array using a long type.
        // It needs to be an int type.
        // Before converting to an int type, check
        // to ensure that file is not larger than Integer.MAX_VALUE.
        if (length > Integer.MAX_VALUE) {
            // File is too large
        	throw new IOException("File too large.");
        }
    
        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];
    
        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length
               && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }
    
        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file "+file.getName());
        }
    
        // Close the input stream and return bytes
        is.close();
        return bytes;
	}
	
	public static byte[] getBytesFromFIS(InputStream is) throws IOException{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		int ch;
		while ((ch=is.read())!=-1) { baos.write(ch); }
		return baos.toByteArray();
	}
	
    public static byte[] getBytesFromFIS(InputStream is, long length) throws IOException{
        
        // You cannot create an array using a long type.
        // It needs to be an int type.
        // Before converting to an int type, check
        // to ensure that file is not larger than Integer.MAX_VALUE.
        if (length > Integer.MAX_VALUE) {
            // File is too large
        	throw new IOException("File too large");
        }
    
        // Create the byte array to hold the data
        byte[] bytes = new byte[(int)length];
    
        // Read in the bytes
        int offset = 0;
        int numRead = 0;
        while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
            offset += numRead;
        }
    
        // Ensure all the bytes have been read in
        if (offset < bytes.length) {
            throw new IOException("Could not completely read file");
        }
    
        // Close the input stream and return bytes
        is.close();
        return bytes;
    }
    
    public static InputStream getISFromString(String xml){
    	if(xml==null) return null;
    	xml = xml.trim();
    	java.io.InputStream in = null;
    	try{
    		in = new java.io.ByteArrayInputStream(xml.getBytes("UTF-8"));
    	}catch(Exception ex){}
    	return in;
    }
    
    public static String getStringFromIS (InputStream in) throws IOException {
        StringBuffer out = new StringBuffer();
        byte[] b = new byte[4096];
        for (int n; (n = in.read(b)) != -1;) {
            out.append(new String(b, 0, n));
        }
        return out.toString();
    }

}
